<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>

<html>
	<head>
		<style type="text/css">
			body {background-color: yellow}
			h1 {background-color: #00ff00}
			h2 {background-color: transparent}
			p {background-color: rgb(250,0,255)}
			p.no2 {background-color: gray; padding: 20px;}
		</style>
	</head>
	<body>
		<h1>这是标题 1</h1>
		<h2>这是标题 2</h2>
		<p>这是段落</p>
		<p class="no2">这个段落设置了内边距。</p>
	</body>
</html>